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hydraulic cylinder tube material and their mechanical properties comparison

04-11-2022

The most popular material or grade for hydraulic cylinder honed tube and pipe.

When we are choosing material, we need to consider their MOQ and their mechanical properties at the same time.

If the sizes of hydraulic cylinder honed tubes are standard, many customer will choose material ST52/E355/Q345B. For this material, the MOQ is only 5 ton for each size , and they have good mechanical properties at the same time.

But when the sizes are not standard and can not be cold drawn , only can be machined to get honed tubing, customer will maybe consider material Ck45 / 45#, when without cold drawn, this material has better mechanical properties than ST52/E355/Q345B.

If customer need higher mechanical properties, we can choose to do quenched and tempered treatment.

For honed pipes manufacturer like us, most of our stock material is 20# / A106B, which is the most material in market. 


We would like to send following tables for customers to make comparison :


Table 1 : Chemical Composition Comparison

 

Grade

C%

Mn%

Si%

S%

P%

ST52/E355/Q345B

0.20

1.7

0.5

0.035

0.035

20# /A106B

0.17-0.23

0.35-0.65

0.17-0.37

0.035

0.035

45# / 1045

0.42-0.50

0.50-0.80

0.17-0.37

0.035

0.035

25Mn

0.22-0.29

0.70-1.0

0.17-0.37

0.035

0.035

27Simn

0.24-0.32

1.10-1.40

1.10-1.40

0.035

0.035

 

Table 2: Mechanical Properties (after cold drawn and + SR or BKS)

 

Grade

Tensile Strength

Mpa

Yield Strength

Mpa

Elongation

%

Hardness

HB

ST52/E355/Q345B

600

500

14

170-210

20# /A106B

500

400

12

150-190

25Mn

630

520

14

170-210

27Simn

780

680

10

220-260

 

Table 3 : Mechanical Properties (not cold drawn pipe, but do machined fabrication directly to get honed tube)

 

Grade

Tensile Strength

Mpa

Yield Strength

Mpa

Elongation

%

ST52/E355/Q345B

470

355

20

20# /A106B

375

245

25

45# / 1045

590

355

14

 

Table 4 : Mechanical Properties (after quenched and tempered)

 

Grade

Tensile Strength

Mpa

Yield Strength

Mpa

Elongation

%

45# / 1045

750

500

15

4140 / 42CrMo

900

800

14

 


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